It has been relatively easier to identify RCB stars than dLHdC stars owing to their spectacular photometric variations. There are 128 RCB stars known in the Milky Way, while only 5 Galactic dLHdC stars were known for the last four decades [1]}, [2]}, [3]}. However, the sample of Galactic dLHdC stars has more than quintupled in the last year with the discovery of 27 new dLHdC stars (Tisserand et al. 2021, submitted). Additionally, several new RCB stars have been discovered and observed spectroscopically at near-infrared (NIR) wavelengths ([3]}).
